Our analytical facilities include four mass spectrometric systems. Two of these systems are fully automated for large throughput of high-precision tritium and helium isotope measurements. The third, semi-automated system is used as a multi-purpose noble gas machine. It is used for measurements of noble gases in groundwater and in rocks (He, Ne, Ar, Kr, and Xe). A fourth system is currently under development and is going to be used for ultra low-level noble gas measurements of speleothem samples. In addition to the mass spectrometric systems, we also have four gas chromatographic systems. These gas chromatographic system are used for measurements of deliberately-injected SF6, environmental levels of SF6 in groundwater and ocean water, and CFC's and SF6 in the atmosphere.
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